program mynormal1, sortpreserve
	version 8.1
	if replay() {
		if (`"`e(cmd)'"' != "mynormal1") error 301
		Replay `0'
	}
	else	Estimate `0'
end

program Estimate, eclass
	syntax varlist [if] [in] [,		///
		Robust				///
		Level(integer `c(level)')	/// -Replay- option
	]

	// check syntax
	gettoken lhs rhs : varlist
	// mark the estimation sample
	marksample touse

	// fit the full model
	ml model d2 mynormal_d2				///
		(mu: `lhs' = `rhs')			///
		/lnsigma				///
		if `touse',				///
		`robust'				///
		maximize

	ereturn local cmd mynormal1

	Replay , level(`level')
end

program Replay
	syntax [, Level(integer `c(level)') ]
	ml display , level(`level')
end
